How could Turbo tax have missed an obvious mistake on my 2022 return?

[laura_borealis]

An error that I discovered this year when reviewing last year's return:

I entered my foreign tax paid as my total foreign dividend income. Is this too "uncommon" an error for it to be part of TurboTax's error-verification protocol? Is it too "granular" an error to be caught? To what extent does TurboTax actually check results before giving a return the green light? 

The feds also missed the error, though, although it is pretty blatant. 

I'm just curious as to whether other people have had this type of a problem.

[fanfare]

TurboTax can't know that you misidentified an amount that you entered.

It can't read your mind.

[laura_borealis]

Because the same amount appears in the forms in both categories (where it has been recorded), whereas total foreign dividend income has to be much higher than the amount of foreign tax paid on it, this should be an obvious red flag.